Решение:
Заполним предложения, используя формы 'there is', 'there are', 'there isn't', 'aren't there', 'is there', 'are there'.
- There are twenty chairs in the classroom. [✓]
- Is there a phone on the table? [?]
- There are two beds in the bedroom. [X]
- There is a desk in the bedroom. [✓]
- There is a rat behind the door. [X]
- Are there four people at home? [?]
Ответ: 1. are, 2. Is there, 3. are, 4. is, 5. is, 6. Are there.